Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2011CHEVY EXPRESS G3500, VAN CARGO EXTENDED, 6.6 LREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSFIXED AND MOVEABLE WINDOWSDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCOMPONENT TESTING
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 L
Component Testing
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 LSECTION Component Testing
Relay Test
- Ignition OFF, disconnect the REAR DEFOG relay.
- Test for 60-180 ohms between terminals 85 and 86.
- If not within the specified range, replace the relay.
- Test for infinite resistance between the following terminals:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If not the specified value, replace the relay.
- Install a 30-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
- If greater than the specified range, replace the relay.
Rear Window Defogger Grid Test
- Ignition ON, turn on the rear window defogger.
- Verify that a test lamp illuminates between each rear window defogger grid line and ground. The test lamp should be off when testing at the ground side of the grid and get brighter as the test lamp moves closer to the voltage supply side of the grid. The test lamp should be dim when testing each grid line in the middle.
- If the test lamp remains bright at the middle of the grid line, test for an open between the test point and the ground side of the grid.
- If the test lamp remains off at the middle of the grid line, test for an open between the test point and the voltage supply side of the grid.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.